Antoine Pitrou commented on ARROW-1345:

When you say nested Numpy array, are you talking about an object array with 
Numpy arrays as items, or a struct array with subarray fields? Could you show a 

> [Python] Conversion from nested NumPy arrays fails on integers other than 
> int64, float32
> ----------------------------------------------------------------------------------------
>                 Key: ARROW-1345
>                 URL: https://issues.apache.org/jira/browse/ARROW-1345
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 0.9.0
> The inferred types are the largest ones, and then later conversion fails on 
> any arrays with smaller types because only exact conversions are implemented 
> thus far

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